高动态范围图像(HDR)色调映射. 这个源码主要展现了计算全局亮度值的Global和计算局部亮度值的bilateral滤镜。是高级图形图像的作业，里面有详细介绍。-High Dynamic Range Image (HDR) color mapping. The main source is calculated to show the value of the overall brightness of the Global and calculation of the value of lo